Q. How can I find the return type (e.g. CR, LF, CR+LF) for each line?

If you set the Character Code at Cursor checkbox in the Status tab of the Customize dialog box, and when the cursor is at end of any line, you will see 0D+0A (CR+LF) or 0D (CR only) or 0A (LF only). You can also check the Show CR and LF with Different Marks in the Marks tab of Properties to distinguish the return types. Since each line can have different return types in EmEditor, this is how EmEditor displays the return types for each line.